20881099512 has 240 divisors, whose sum is σ = 73270141560. Its totient is φ = 5506994304.

The previous prime is 20881099501. The next prime is 20881099559. The reversal of 20881099512 is 21599018802.

20881099512 is a `hidden beast` number, since 20 + 8 + 8 + 109 + 9 + 512 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 387483 + ... + 438069.

Almost surely, 2^20881099512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20881099512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36635070780).

20881099512 is an abundant number, since it is smaller than the sum of its proper divisors (52389042048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20881099512 is a wasteful number, since it uses less digits than its factorization.

20881099512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50632 (or 50612 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The spelling of 20881099512 in words is "twenty billion, eight hundred eighty-one million, ninety-nine thousand, five hundred twelve".